Nick, Wow! That must have been an incredible experience, running and navigating so well. I am really surprised that more hasn't been done with mobility aids. Wouldn't you think there's been enough advancement in electronics to make something small and sensitive enough to allow us to travel more safely? With quiet cars coming on the scene, it surprises me that modern devices like the sonic guide and Mowat sensor aren't a priority. Mary to view the list archives, go to: www.freelists.org/archives/optacon-l To unsubscribe at any time, just send a message to: optacon-l-request@xxxxxxxxxxxxx with the word "unsubscribe" (without the quotes) in the message subject. Tell your friends about the list. They can subscribe by sending a message to: optacon-l-request@xxxxxxxxxxxxx with the word "subscribe" (without the quotes) in the message subject.